package lesson04

import scala.collection.mutable

object MapTest {
  def main(args: Array[String]): Unit = {
    val map = new mutable.HashMap[String,Int]()
    map.put("tom",100) //java
    map("lee")=101
    map += ( ("Ma" -> 102),("Mas" -> 103) )

    map.remove("tom")//java
    map -= "Mas"

  //  map.groupBy()

  }

}
